C++ da funksiyalar bilan ishlash

#include
#include
// funksiya prototipi
float hisobla(float , float );
int main()
{
float c;
c = hisobla(3, 4);
cout << c << endl;
c = hisobla(6, 8);
cout << c << endl;
c = hisobla(12, 5);
cout << c << endl;
system ("pause");
return 0;
}
float hisobla(float a, float b)
{
//lokal o'zgaruvchi
float natija;
natija = sqrtf(a*a + b*b);
return natija;
}

2) void toifasidagi parametrli funksiya

#include
#include
// funksiya prototipi
void hisobla(float , float );
int main()
{
hisobla(3, 4);
hisobla(6, 8);
hisobla(12, 5);
system ("pause");
return 0;
}
void hisobla(float a, float b)
{
float c;
c = sqrtf(a*a + b*b);
cout << c << endl;
}

Misol 2: Global va lokal o'zgaruvchilarga murojaatni  o'rganish

#include
int x = 5; // global o'zgaruvchi
int main()
{
int x = 9; // lokal o'zgaruvchi
std::cout << "lokal  x=" <<   x << std::endl;
std::cout << "global x=" << ::x << std::endl;
system ("pause");
return 0;
}

Misol 3: Kiritilgan  n sonini 3 - darajasini hisoblovchi funksiya  tuzilsin

#include
void kub (int *);
int main()
{
int n;
cout << "n="; cin >> n;
kub (&n);
cout << "n ning qiymati =" << n << endl;
system ("pause");
return 0;
}
void kub (int *nPtr)
{
*nPtr = *nPtr * *nPtr * *nPtr;
}

Misol 4: Ikkita son yig'indisini  funksiya orqali hisoblovchi dastur tuzilsin
#include
// funksiya prototipi
int  sum(int , int);
void sum(int , int, int *);
int  sum(int *, int *);
void sum(int *, int *, int *);
int main()
{
int a, b, c;
cout << "a="; cin >> a;
cout << "b="; cin >> b;
c = sum(a, b);
cout << "1-sul natijasi=" << c << endl;
sum(a, b, &c);
cout << "2-sul natijasi=" << c << endl;
c = sum(&a, &b);
cout << "3-usul natijasi=" << c << endl;
sum(&a, &b, &c);
cout << "4-usul natijasi=" << c << endl;
system ("pause");
return 0;
}
// 1 - usul
int sum(int son1, int son2)
{
int natija;
natija = son1 + son2;
return natija;
}
// 2 - usul
void sum(int son1, int son2,int *natija)
{
*natija = son1 + son2;
}
// 3 - usul
int sum(int *son1, int *son2)
{
int natija;
natija = *son1 + *son2;
return natija;
}
// 4 - usul
void sum(int *son1, int *son2,int *natija)
{
*natija = *son1 + *son2;
}